Henry bornstein



(No Model.)

H. BORNSTEIN.

WRENCH.

No. 434,912. Patented Aug. 26, 1890.`

i UNITED STATES PATENT OEEICE.

HENRY BORNSTEIN, OF BOSTON, MASSACHUSETTS,ASSIGNOR OF ONE-HALF TOCHARLES GREEN, OF SAME PLACE.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 434,912, dated August26, 1890.

Application filed June 17, 1890. Serial No. 355,728. (No model.)-

T all whom t may concern.-

Be it knownthat I, HENRY BoENsrEIN, of Boston, in the county ofS11ffolk,State of Massachusetts, have invented certain new and usefulImprovements in XVrenches, of which the following is a descriptionsufficiently full, clear, and exact to enable any person skilled in theart or science to which said invention appertains to make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification, in which- Figure 1 is an elevation of my improvedwrench; Fig. 2,a sectional elevation showing the check-nut turned awayfrom the jaw, and Fig. 3 is a vertical transverse section taken throughthe check-nut.

Like letters of referenceindicate corresponding parts in the differentfigures of the drawings.

My invention relates especially to that class of wrenches known asmonkey-wrenches,

, and it consists in certain novel features hereinafter fully set forthand claimed,the object .being to produce a simpler, cheaper, and moreeffective device of this character than is now in ordinary use.

The nature and operation of the improvement will be readily understoodby all conversant with such matters from the following explanation.

In the drawings, A represents the handle of the wrench, and B the body,on one end of which said handle is mounted. The body is exteriorlyscrew-threaded, andis interiorly tapped and screw-threaded. The movablejaw O is hollow, and is interiorly threaded to receive the body B. Thefixed jaw D has a stem b, rectangular in orosssection, which is tted toslide in the corresponding mortise in the jaw C. Two sides of the jaw Care open at CZ, and a stop f projectsinto said openings. The inner endof the stem ZJ is reduced at g, and has its edges screw-threaded at h towork in the interior threads of the body B. A check-nut II is mounted onthe body B in position to be turned into engagement with the lower endof the movable jaw U. Said nut is provided with a curved groove orchamber m in its upper edge, and a pin or 5o boss t formed on the lowerend of said jaw C projects into said chamber.

In the use of my improvement, by turning the handle A from left toright, as viewed in Fig. l, and holding the jaw C stationary, the jaw Dis forced rapidly out from the jaw O, the threaded body B at the sametime advancing into said jaw C, this movement quickly opening` thewrench-jaws. lVhen adj usted at the proper distance to receive the nut,the check-nut I-I may be quickly turned up against the j aw C,preventing it from accidentally turning on the body B. By means of thepin t projecting into the chamber in said nut, said nut is preventedfrom being turned away from the jaw sufficiently to interfere with themovement of the body B therethrough. The nut is, moreover, held by saidpin so that it may be quickly turned against the jaw when it is desiredto secure the same. This enables the wrench when employed continuouslyupon work of the same size to be readilyhandled without repeatedlyadjusting the jaws, as is necessary in wrenches of ordinaryconstruction.

Having thus explained my invention,what I claim is 1. In a wrench, aninteriorly and exteriorly screw-threaded body provided with a handle, incombination with a movable jaw interiorly threaded to receive saidhandle and sliding on the stem of the fixed jaw, a portion of said stembeing reduced and threaded to work in said body, a check-nut on saidbody provided with a groove or chamber, and a pin on said movable jawprojecting into said chamber, substantially as described.

2. In a wrench, an interiorly and exterior-ly scre .v-threaded bodyprovided with a handle, in combination with a fixed jaw having arectangular stem, the inner end of said stem being reduced andscrew-threaded on opposite edges to work in said body, a movable jawfitted to slide on the rectangular portion of said stem and interiorlyscrew-threaded to receive said body, a stop on said stem, a check-nut onsaid body, and a pin on said movable jaw projecting into a curved grooveor chamber in said nut, all being combined to receive said body, the nutH on said body, 1o and arranged to operate substantially as set providedwith the chamber on, and the pin ,t forth. on said movable jawprojecting into said 3. Inawrenoh,tl1einteriorlyzmdexteriorly chamber,substantially as and for the pur- 5 screw-threaded body B, provided withthe pose set fort-h.

handle A, in combination with the jaw B, hav- HENRY BORNSTEIN. ing thestem b reduced and screw-threaded lVitnesses:

at g, the 'stop f on said stem, the jaw C, slid- O. M. SHAW,

ing on said stem andinteriorlyscrew-threaded REUBEN SIMMONS.

